Whether you blame Google or the often slow moving World Wide Web
Consortium (W3C), the results have been particularly evident
throughout 2017. Google has been at the center of a lot of “works
best with Chrome” messages we’re starting to see appear on the web.
Google Meet, Allo, YouTube TV, Google Earth, and YouTube Studio Beta
all block Windows 10’s default browser, Microsoft Edge, from
accessing them and they all point users to download Chrome instead.
Google Meet, Google Earth, and YouTube TV are also not supported on
Firefox with messages to download Chrome. Google has publicly
promised to support Earth on Edge and Firefox, and the company is
“working to bring YouTube TV to more browsers in the future.”

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Just another in a long string of reasons that I'll not make Chrome a
default browser.

Sailfish,
Agreed with not making Chrome a default browser.

I thin there is a major defect in the FF browser where we select Real
U A; in that selecting Chrome does not allow access to tv.youtube.

I've not tried tv.youtube nor Real UA but I suspect that Google may use
other intrinsic means rather than UA string to detect that Chrome is not
running. After all, if they've implemented Google-specific elements, how
hard would it be for them to simply test to see if a Google-specific
element exists?

Well, the only reason for installing Chrome was to reduce the monthly
cost of cable TV,